Drilling machine



Invei/ow; G60 @9611. GSi/Twain by M7 d June 1 1926.

G.4 H. GILMANv DRILLING MACHINE Patented June 1, 1926.

unirse STATES GEORGE H. Gl-LMAN, OF BOSTON, MASSACHUSETTS.

DRILLING MACHINE.

Application led December My invention relates to machines having tools rotated by means of a reduction gearing and particularly but not exclusively to those for drilling a rock and employing a motor for rotating the tool and in this respect comprehends drilling machines in which the tool performs its work by rotative action alone or in addition has imparted thereto percussive action.

My invention will be best understood from the accompanying drawings when read in light of the following` specification of one specific embodiment of my invention submitted for illustrative purposes while its scope will be more particularly pointed out in the appended claims.

In the drawings Figure 1 shows a longitudinal section through the front end of a hammer rock drill provided with an independent motor for rotating the drill;

Figs. 2, 3 and 1 respectively are sections on the lines 2 2, 3-3 and 4-4 of Fig. 1.

Referring to the drawings I have shown the front end of a hammer drill, the cylinder 1 having a reduced diameter portion 2 shown integrally formed therewith. Mount- 'ed for reciprocation in the cylinder is a piton having a head portion 3 and a hammer bar portion 4l. Forwardly of the hammer bar is the chuck 5 which carries in non-rotatable relation thereto a drill bit G having the usual cutting end 410, the rearward end of the shank of the drill being adapted to be struck by the hammer bar portion of the piston at the forward end of the piston stroke. For rotating the chuck I provide a fluid operated motor comprising` the central rotor 7 and the side rotors 8, the central rotor surrounding the reduced diameter portion of the cylinder and as shown being aligned with the bit and mounted coaXially therewith.

Enclosing the rotors of the chuck rotating motor is a casing 9 provided with suitable bores 10 for vthe side rotors and a bore 11 for the central rotor. Foroperating the motor I provide the casing with motive fluid inlets 12. and exhaust ports 13, the latter opening through the casing and communieating with the atmosphere. Any suitable means may be provided for 'supplying motive fluid to the intake ports of the motor as 7, 1920. serial No. 428,958.

for example, conduits 14 formed in the wall of the cylinder', one of which is shown in Fig. 2.

For supporting the side rotors I provide spindles l5, and for supporting the spindles I mount the opposite ends of the same in recesses respectively formed in the casing and the cylinder. The side rotors are recessed as indicated at 16 to receive the antifriction bearing rollers 17, which coact with the spindles to provide bearings for such rotors. The central rotor is secured by means of a rey 18 to a shaft in the form of a sleeve 19 having an interior bearing 20 on the reduced diameter portion of the cylinder.

Exteriorly of the motor casing I provide `a bearing member 21 and for operatively connecting it to the central rotor I show it as inte, 2;rally formeel with the sleeve 19. This bearing` is provided with a bore, the

' surface of which is in rotatable contact with the forward portion of the reduced diameter portion 2 of the cylinder and on the exterior portion thereof is provided a cylindrical bearing surface 22, the axis of which is inclined to the axis of the cylinder. Rotatively carried by the bearing member I provide a gear member 23 which has formed on "Jopposite sides thereof oppositely facing series of gear teeth 24 and 25. For holding` the gear member in position I provide a collar 26 sui'i-oiiiidingtlie end of the reduced diameter portion of the cylinder and having an end surface abutting the rearward face 27 Y of the chuck and on the opposite side thereof a surface 28 in contact with the side of the gear 23. As illustrated this collar is provided with a reduced diameter portion 29 affording a cylindrical surface 30 inclined to the axis of the machine, which surface conforms to the interior surface of a similar recess formed in the end of the bearing inember 21. It will be noted by this construction that after the collar has been placed in the recess of the bearing memberv and the two have been placed over the reduced diameter portion of the cylinder that the collar is securely locked to the bearing` member.

Carried by the machine is a fixed series of gear teeth 34 which I have shown formed on the frontend of the motor casing and meshing with the series of gear teeth 24, while carried by the chuck is another series of gear teeth 35 adapted to mesh with the series of gear teeth 25. When the bearing member 21 is rotated by the motor, the gear is moved to cause the series of gear teeth 24 to roll around the series of gear teeth 34 and the series of gear teeth 25 to roll. around the series of gear teeth 3V. If the gear set 2l -34 is of different ratio than the gear set 25-35, the chuck will be rotated at a speed proportional to this difference in ratio, for example, if the difference in ratio is that corresponding to the difference of one tooth then for one revolution of the central rotor of the motor, the clinch Will be advanced a distance corresponding to the pitch of one tooth.

Forward-.ly of the motor casing I have shown a chuck casing 31 ivhich rotatably supports the chuck 5. As is common practice the chuck casing provides lateral and generally radial bearings for the chuck herein exemplified by the lateral bearing B2 and the generally radial bearing the latter of which may take the longitudinal thrust of the gearing on the chuck. rhis thrust on the chuck which is caused by the generally radial position of the gear teeth relatively to the axis of the chuck acts to hold the chuck at all times While the machine is in operation vagainst the radially disposed bearings of the chuck on the chuck casing, as for example against the bearing 33, and therefore prevents vibration of the chuck in the direction of the axis of the machine when the machine is in operation, and similarly axial vibration of the gear Q?) is prevented. I have found that the prevention of vibration of 'the chuck, for example, materially adds to the durability and better performance of the machine and prevents breakage and excessive Wear due to vibration. ing` to the generally radial position of the gear teeth the Wear in the generally disposed bearings is automatically taken up.

For holding the parts in assembled relation l provide the bolts e6 shoivn with heads 37 engaging the flanges 38 formed on the cylinder and the nuts 39 engaging the chuck casing.

Ahhough l have described a specific embodiment of my invention for illustrative purposes, it will be understood that l am not to be limited thereby to its particular proportions and arrangeinei'it of parts and that extensive deviations may be made therefrom Without departing from the spirit of my invention.

Claims l. ln a drilling machine, a drilling tool, a chuck carrying said drilling` tool, a rotary shaft, a tubular casing, a hammer iston in said casing having a hammer bar extending into said tubular shaft, a second surrounding said tubular shaft and containing lt Will be observed that ovva gear toothed member carried by said shaft, means for causing a pressure liuid to rotate said gear toothed member for roqatingl shaft, an annular of g mr teeth car b y said second casing a l the lin-ward su, thereof, an annular series of gear teeth carried by said chuck, a member driven by said shaft having tivo annular series of gear teeth, one meshing with the tirst and the other With the second mentioned series and forming therewith gear sets of dii'lerent ratio, and the gear teeth of all said annular series of gear teeth being disposed generally radially to the axis of said chuck.

2. ln a percussive drilling machine, a drilling tool, a chuck for said tool, a. driven member having rotatably mounted hereon tivo series of gear teeth, relativff, "at ary series of gear teeth in meih with one of said first mentioned series and atordii'ig a gear set of one ratio, a series of teeth connected to rotate said chuck in mesh with the other of said first mentioned series and affording a gear set of a dillilerent ratio, a sleeve coa ial with raid chuck supporting and driving said driven member, mean.` providing a substantially radially disposed thrust bearing for said chuck. and the gear teeth of each series of gear teeth being disposed generally radially to the axis of said chuck.

3. ln a percnssive drilling machine, drilling tool, a chuck for said tool, a tubular rotary shaft in alignment with tool, a stationary tubular part supporting said tubular shaft, means extending through said tubular part for imparting impact to said tool, a motor for rotating said shaft, a bearing driven by said siatt having an annular surface surrounding the axis of said tool and shaft and inclined thereto, a member carried on said bearing having tivo series of gear teeth, a stationary series of gear teeth carried by said machine meshing with one of the first named series and affording a gear set of one ratio, a series of gear teeth in driving relation to said chuck meshing with the other of the tiret named series and alii'ording a gear set of different ratio, the gear teeth of each series of gear teeth being disposed generallv radially to the anis of said I chuck, and a subst: tially radially disposed thrust henri said chuck.

4. In a percussive drilling machine, a chuck, a drilling` tool carried thereby, a geared member, a support for said geared member surrounding said tool, fluid pressure means for rotating said geared member, a bearing member interposed between said geared member and chuck and in driving relation with the former, said bearing member having a bearing surface thereon inclined to the anis of said tool, a, member rotatively supported by said bearing and Cil having two series of gear teeth, a static-nary seriesv of gear teeth carried by said machine meshing' with one of the first named series and affording a gear set of one ratio, a series of gear teeth in driviirg relation to said chuck meshing with the other of the first named series and affording a gear set of different ratio, the gear teeth of each series of gear teeth being disposed generally radially to the aXis of said chuck, and a substantially radially disposed thrust bearing for said chuck.

5. In a percussive drilling machine, a chuck, a tool carried thereby, a motor, a tubular member surrounding said drill steel, a sleeve supported by said tubularmember and rotated by Said motor, a bearing inclined to the axis of the tool driven by said sleeve, a member carried on said bearing having two series of gear teeth, a stationary series of gear teeth carried by said machine meshing with one of the firstnamed series and affording a gear set of one ratio,a series` of gear teeth in driving relation to said chuck meshing with the other of the first named series and affording a gear set of different ratio, the gear teeth of cach series `motor, a bearing inclined tothe axis of the tool driven by said sleeve, a member carried on said bearing having two series of gear teeth, a stationary series of gear teeth carried by said casing meshing with one of the first named series and affording a gear set of one ratio, a series of gear teeth in driving relation to said chuck meshing with the other of the first named series and affording a gear set of different ratio, the gear teeth of said last named gear set being disposed generally radially to the axis of said chuck, and a substantially radially disposed thrust bearing for said chuck.

7. In a drilling machine, aV hammer piston, a chuck, a tool carried by said chuck, a motor having a hollow rotor aligned with said tool, a hollow bearing member for supporting said rotor extending through said casing and having a bearing surface forwardly of said casing, said surface being linclined to the axis of said rotor and rotatably supporting a gear structure, means for transmitting the force of said hammer piston through said bearing member, said `gear structure having two series of gear teeth,

a stationary series of gear teeth carried by said machine meshing with one of the first Ynamed series and affording a gear set of ton, a chuck, a drilling tool carried by said chuck, a geared member, fluid pressure means for rotating saidv geared member, means for transmitting the force of said hammer piston through said geared meinber and fiuidV pressure means, a bearing Y:

member interposed between said geared member and chuck and in driving relation with the former, said bearing member having a bearing surface thereon inclined to the aXis of said tool, a member rotatively supported by said bearing and having two series of gear teeth', a stationary series of gear teeth carried by Vsaid machine meshing with one of the first named series and affording a gear set of one ratio, a-series of gear teeth in driving relation to said chuck meshing with the other of the first named `series and affording a gear set of different ratio, the gear teeth of said last named gear set being disposed generally radially to the aXis of said chuck, and a substantially radially disposed thrust bearing for said chuck.

9. In a drilling machine, a hammer piston, a chuck, a tool carried by said chuck, a motor having a hollow rotor aligned with said too-l and a siderotor cooperating with the first mentioned rotor, a bearing member surrounded by said rotor and havinfg a bearing surface inclined to 'the axis of said rotor,'said bearing surface rotatably supporting a gear structure, means for transmitting the force of said hammer piston through said rotor and bearing member, said gear structure having two series of gear teeth, a stationary series of gear teeth carried by said machine meshing with one of the first named series and affording a gear set of one ratio, a series of gear teeth in driving relation to said chuck meshing with the other of the first nam-ed series and affording agear set of different ratio, the gear teeth kof said last named gear set being disposed generally radially to the aXis of said chuck, and a. substantially radially disposed thrust beariifg for said chuck.

10. In a percussive drilling machine, a chuck, a drill bit carried thereby, a reciprocatory hammer piston, a motor for rotating said chuck, a stationary series of gear teeth carried by said machine, a second series of gear teeth in driving relation to said chuck, a vvabbling gear having two series of gear teeth and affording a driving connection between the two first mentioned series, the

I (i i) Cil gear teeth ot each series ot gear teeth being disposed generally radially to the axis oit said chuck, means providing a thrust bearing ior said chuck, and means for imparting the momentum ot said hammer piston through said gear to the cutting point ot said drill bit.

ll. ln a percussivc drilling machine, a chuck, a drill bit carried thereby, a reciprocatory hammer piston, a motor tor rotating` said chuck and having a rotor aligned with said drill bit, a stationary series ot gear teeth carried by said machine, a second series elf gear teeth in driving relation to said chuck, a wabbling gear having two series el' gear teeth and aii'ording a driving connection between the two irst mentioned series` the gear teeth et each series ot gear teeth being disposed generally radially to the axis ot sait chuck, means providing a thrust bearing tor said chuck, and means for imparting the momentum ot said hammer piston through said gear and rotor to the cutting point ot said drill bit.

12. ln a percussive drilling machine, a chucl, a drill bit having a shank carried by said chuck, a reciproeatory hammer piston having a hammer bar, a stationary series ot gear teeth, a series ot gear teeth carried in driving relation to said chuck, the gear teeth ot each series ot gear teeth being disposed generally radially to the axis ot said chuck, means providing a thrust bearing tor said chuck, a wabbling gear aiording driving connection between said series ot gear teeth, finid pressure actuated motor means tor driving said gear, means including said hammer bar and shank tor transmitting the torce or" said piston to the cutting point ot said drill bit, and said gear being adapted to surround said hammer bar and drill bit.

in a percussive drilling machine, a chuck, a drill bit carried thereby, a reciprocatory hammer piston having a hammer bar, a stationary series ot gear teeth, a series ot gear teeth carried in drivingl relation to said chuck, the gear teeth of each series of' gear teeth being disposed generally radially to the axis ot' said chuck, means providing` a thrust bearing tor said chuck, a wabbling gear affording a driving connection between said series oit gear teeth, motor having a rotor tor driving said gear, and said rotor being adapted to surround said hammer bar.

14. ln a drilling machine, a drill bit, a cylinder having a reciprocatory hammer piston therein, a motor having a rotor sur rounding said cylinder, a stationary series ot gear teeth carried in listed relation to said cylinder, a chuck tor said drill bit carried in rotatable relation to said cylinder, a series of gear teeth in driving relation to said chuck, the gear teeth of each series of gear teeth being disposed generally radiallgT te the axis ot said chuck, means providing a thrust bearing 'l'or said chuck, a wabbling gear surrounding said cylinder and afford* ing a driving connection between said series ot gear teeth, and means tor driving said gear.

l5. ln a drilling machine, a drill bit, a cylinder having a reciprocatory hammer piston therein, said cylinder having a portion ot' reduced diameter, a chuck rotating motor having a rotor surrounding said portion ot' reduced diameter', a stationary series ot gear teeth carried in iixed relation to said cylinder, a chuck tor said drill bit carried in rotatable relation to said cylinder, a

cylinder' having a reciprocatory hammer piston therein, said cylinder having a portion et reduced diameter, a clinch rotating motor having a rotor surrounding` said portion otl reduced diameter, a stationary series at gear teeth carried in fixed relation to said cylinder, a chuck tor said drill bit carried in rotatable relation to said cylinder, a series et gear teeth in driving relation to said chuck, the gear teeth et each series ot gear teeth being disposed generally radially to the axis ot said chuck, means providing a thrust bearing for said chuck, a wabblint,T gear carried by said reduced diameter portion affording a driving connection between said series ot gear teeth and means for driving sain gear by said motor.

17. ln a rock drill, a casing containing a hammer piston, a chuck and a motor all coaXially arranged, a drill steel carried by said chuck, facing annular series ot gear teeth on said chuck and casing, the gear teeth ot each series of gear teeth being disposed generally radially to the aXis o'f said chuck, means providing a thrust bearing tor said chuck, a gear driven by said motor meshing with both series of gear teeth, and a hearing for said gear through which the impact ot said piston is communicated to said drill steel.

1S. In a rook drill, a casing comprising a cylinder having a forwardly projecting tubular extension, a motor and a gear driven by the motor both mounted on said tubular extension, a chuck located forwardly ot said extension, generally radially disposed facing gear teeth on said chuck and easing, said gear having two sets of generally radially dis )osed gear teeth respectively meshing wit the gear teeth on said chuck and ing, means providing a thrust hearing tor said chuck, and a piston in said cylinder for imparting impact to said drill steel through said tubular extension.

19. In a rock drill, a cylinder, a hammer piston, a chuck, a drill steel carried by said chuck, a motor for rotating said chuck, a wabbling gear for connecting said motor and chuck, a bearing member for said gear, a collar on said bearing member for retaining,` said Wabbling gear, a tubular member through which the force of said piston is transmitted tosaid drill steel, said bearing member and collar being mounted :tor rotation on said tubular member, and a sleevejoint-connection between said collar and bearing member inclined to the axis oi rotation sufliciently to retain said collar on said bearing` member.

In testimony whereof, I have signed my naine to this specification.

GEORGE H. GILMAN.

Certiicate of Correction.` It is hereby certified that in Letters atent No. 1,587,298, granted June 1, 1926,

upon the application of George H. Gilman, of Boston, Massachusetts, for an 11nprovernent in Drilling Machines, errors appear in the printed specification requiring correction as follows: Page 2, line 61, claim 1, before the Word rotar;T insert the Word tubular, and line 62, strike out the word tubular and that the said Letters Patent should be read with these corrections therein that the saine may conform to the record of the case in the Patent Oirice.

Signed vand sealed this 13th day of July, A. D. 1926.

[SEAL] M. J. MOORE,

Acting Commissioner of Patents. 

